rs782121531

chr6-112191681-C-Gchr6-112191681-C-T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4 BP6_Moderate BS2

The NM_001105206.3(LAMA4):c.673G>C(p.Ala225Pro) variant causes a missense change. The variant allele was found at a frequency of 0.0000161 in 1,613,956 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A225T) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000015 (0 hom.)
• Consequence: LAMA4 NM_001105206.3 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 4.70

Genes affected

LAMA4 (HGNC:6484): (laminin subunit alpha 4) Laminins, a family of extracellular matrix glycoproteins, are the major noncollagenous constituent of basement membranes. They have been implicated in a wide variety of biological processes including cell adhesion, differentiation, migration, signaling, neurite outgrowth and metastasis. Laminins are composed of 3 non identical chains: laminin alpha, beta and gamma (formerly A, B1, and B2, respectively) and they form a cruciform structure consisting of 3 short arms, each formed by a different chain, and a long arm composed of all 3 chains. Each laminin chain is a multidomain protein encoded by a distinct gene. Several isoforms of each chain have been described. Different alpha, beta and gamma chain isomers combine to give rise to different heterotrimeric laminin isoforms which are designated by Arabic numerals in the order of their discovery, i.e. alpha1beta1gamma1 heterotrimer is laminin 1. The biological functions of the different chains and trimer molecules are largely unknown, but some of the chains have been shown to differ with respect to their tissue distribution, presumably reflecting diverse functions in vivo. This gene encodes the alpha chain isoform laminin, alpha 4. The domain structure of alpha 4 is similar to that of alpha 3, both of which resemble truncated versions of alpha 1 and alpha 2, in that approximately 1,200 residues at the N-terminus (domains IV, V and VI) have been lost. Laminin, alpha 4 contains the C-terminal G domain which distinguishes all alpha chains from the beta and gamma chains. The RNA analysis from adult and fetal tissues revealed developmental regulation of expression, however, the exact function of laminin, alpha 4 is not known. Tissue-specific utilization of alternative polyA-signal has been described in literature. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.36465108).
• BP6: Variant 6-112191681-C-G is Benign according to our data. Variant chr6-112191681-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 580100.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High AC in GnomAdExome at 19 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LAMA4	NM_001105206.3	c.673G>C	p.Ala225Pro	missense_variant	6/39	ENST00000230538.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LAMA4	ENST00000230538.12	c.673G>C	p.Ala225Pro	missense_variant	6/39	1	NM_001105206.3	A1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152194 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000770

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000758 AC: 19 AN: 250794 Hom.: 0 AF XY: 0.0000738 AC XY: 10 AN XY: 135544

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00104

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000151 AC: 22 AN: 1461762 Hom.: 0 Cov.: 32 AF XY: 0.0000138 AC XY: 10 AN XY: 727206

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000504

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152194 Hom.: 0 Cov.: 32 AF XY: 0.0000403 AC XY: 3 AN XY: 74354

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000770

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000264

ExAC AF: 0.0000659 AC: 8

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dilated cardiomyopathy 1JJ Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Aug 09, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Benign	-0.013	T
BayesDel_noAF	Pathogenic	0.16
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.061	T;T;T;T;.
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.90	D;.;.;D;D
M_CAP	Benign	0.052	D
MetaRNN	Benign	0.36	T;T;T;T;T
MetaSVM	Uncertain	0.052	D
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.57	T
PROVEAN	Uncertain	-2.7	D;D;D;D;D
REVEL	Uncertain	0.45
Sift	Uncertain	0.014	D;D;D;D;D
Sift4G	Uncertain	0.0070	D;D;D;D;.
Vest4		0.72
MutPred		0.60		Gain of disorder (P = 0.047);Gain of disorder (P = 0.047);Gain of disorder (P = 0.047);Gain of disorder (P = 0.047);Gain of disorder (P = 0.047);
MVP		0.75
MPC		0.65
ClinPred		0.52	D
GERP RS		5.7
gMVP		0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs782121531; hg19: chr6-112512883;